Warp beam and method of assembling



April 7, 1959 s. A. HARRIS WARP BEAM AND METHOD OF ASSEMBLING Filed April 21, 1955 3 Shets-Sheet 2 INVEN TOR- April 7, 1959 s; A. HARRIS WARP BEAM AND METHOD OF ASSEMBLING 3 Sheets-Sheet 3 Filed April 21. 1955 679M054 4 fleas;

INVENTOR.

BY 4W United States Patent 2,880,944 WARP BEAM AND METHOD OF ASSEMBLING Samuel A. Harris, Winston-Salem, NC.

Application April 21, 1955, Serial No. 502,829

12 Claims. (Cl. 242118.62)

This invention relates to warp beams or the like and to methods of assembling the parts of such constructions. Warp beams, as now most commonly used in the textile and other trades requiring filamentary material to be wound on bobbin or spool-like constructions, comprise principally a tubular barrel and two flanges or heads secured to the barrel ends in any of a number of ways not altogether satisfactory. This, in one form of construction, the heads are screwed onto the barrel ends with such force as to cause the barrel ends to rub frictionally against and dig or bite into the heads, raising burrs which tend to catch and damage filamentary material wound on'the beams. In other previously known constructions, the heads are drawn axially against the barrel ends by screws or bolts, thus eliminating the burring and other disadvantages of the conventional screw-on construction first referred to; but in the second construction other disadvantages are encountered. Among these is the expense of working to close tolerances in positioning the beam heads at opposite ends of a barrel in the particular angular relation required to cause drive transmitting means on the heads to register with drive transmitting connections external of the beam and themselves being in predetermined angular relation.

An object ofthe present invention is to provide a warp beam of strong construction capable of standing up in service under the tremendous pressures or forces generated by warping or winding of filamentary material in present day practice, which eliminates the major disadvantages of previously known constructions, and which may be manufactured and assembled economically.

Another object of the invention is to provide such a construction in which a differentially threaded connecting element interposed between a beam end and associated head enables the angular position of the head relative to the barrel to be selected or adjusted by the turning of a threaded element, and which also enables the beam barrel and head to'be clamped or locked tightly together by screw thread action without, however, causing the barrel end to rub frictionally against and bite or dig into the head. w

A further object of the invention is to provide a new and improved method of assembling a warp beam head and barrel.

Other objects of the invention will become apparent from a reading of the following description, the appended claims, and the accompanying drawing, in which:

Figure 1 is a fragmentary front elevational view of a section warp beam embodying the inventionshown associated with beam driving mechanism, certain parts being shown in section;

Figure 2 is an end elevation of the warp beam shown in Figure 1, drawn on an enlarged scale;

Figure 3 is a front elevation of the section beam shown in Figures 1 and 2, drawn on an enlarged scale as compared to Figure 1, with means for connecting a head or flange to a beam barrel being shown in section;

Figure 4 is a fragmentary longitudinal sectional view 2,880,944 Patented Apr. 7, 1959 ice showing, on an enlarged scale, the connecting construction shown in Figure 3;

Figure 5 is a view similar to Figure 4, but showing a modified form of connecting means;

' Figure 6 is a fragmentary perspective view of one kind of tool which may be used for effecting firm connection of a beam head or flange to a beam barrel;

Figure 7 is a fragmentary perspective view of an alternative form of tool;

Figure 8 is a prespective view of a connecting element embodied in the construction shown in Figure 5;

Figure 9 is a view partly in front elevation and partly in longitudinal section showing a construction embodying the invention in a tricot beam;

Figure 10 is an end elevation of the construction shown in Figure 9; and

Figure 11 is a perspective view of a tricot beam arbor adapted for use in connection with the tricot beam shown in Figures 9 and 10, drawn on a reduced scale.

The invention may be embodied in warp beams or similar spools or flanged winding drums, and is especially suited for use in connection with such constructions in which very large pressures or forces are exerted against the end flanges or heads, as for example when winding particularly strong threads, yarns or other filaments. Figures 1 to 4 inclusive illustrate the invention as being embodied in a section beam, and associated equipment. The section beam, generally designated S, comprises a hollow or tubular barrel 1 provided with end flanges or heads 2, 2, to form a spool or bobbin like construction. The end flanges or heads 2, 2 are provided respectively with mounting plates or discs 3, 3 secured to the beads by screws 4, 4, the plates 3, 3 being formed with stub shafts or pins 5, 5 which extend axially and outwardly of the section beam. The pins 5, S project into bushings 6, 6 formed in retractable chucks 7, 7 carried respectively by shaft 8, 8 journalled in any suitable bearings, not shown. By this construction, the section beam S is mounted for rotation.

Means, which may be'of a known form, is provided for rotating the beam S, preferably by applying torque to both of its ends. In the form shown, a drive shaft 9 is mounted by bearings (not shown) to extend parallel to the common axis of theshafts 8, 8 and the beam S. The shaft 9 is equipped with pinions 10, 10* which mesh with gears 11, 11 respectively fixed to the shafts 8, 8. By this arrangement, driving of the shaft 9 by a motor (not shown) causes rotation of the shafts 8, 8 at the same speed.

I In order to transmit driving torque from the shafts 8, 8 and chucks 7, 7 to the associated beam heads 2, 2 the latter are provided with bushed drive connection socket means 12, 12* adapted respectively to receive driving elements or pins 13, 13 carried by the chucks 7, 7*. To facilitate mounting the beam S and removing it, the driving pins 13, 13 are arranged to be retracted and thus disengaged from the bushed apertures 12, 12. To this end, the pins 13, 13 are mounted to slide in holes 14, 14 in flanges 15, 15 of the chucks 7, 7 The pins 13, 13 are equipped with stems 16, 16 surrounded by springs interposed between the pins and the roots of the holes 14, 14. One such spring 17 is shown in Figure 1 from which it will be clear that the spring urges the associated pin 13 toward a position of engagement in the associated drive socket 12 in the head 2. A similar spring, not shown, is associated with the driving pin 13 at the other end of the beam S. Finger knobs 18, 18 are provided on the pin stems 16, 16 for facilitating retracting of the pins when it is desired to disengage them from the associated drive connection sockets.

It is apparent that when the shafts 8, 8 are rotated in unison, the pins 13, 13 will transmit driving torque to both ends of the beam S. Inasmuch as the relative angular positions of the pins 13, 13 are fixed because of the constant meshing of the gears 11, 11*- with their associated pinions 10, it follows that the angular relation between the sockets 12, 12 mustalso be fixed and must correspond at all times to the. relative angular positions of the pins '13, 13. Previously known constructions or methods for establishingthe required angular relation between the drive sockets or equivalent drive. devices at opposite ends of warp beams have been subject to some difliculties and have required relatively expensive precision manufacturing or assembling procedures. semble a beam barrel and its end flanges or heads in such manner as to provide for a strong and efiicient connection between the barrel ends and the heads, and at the same time to place the drive sockets or other drive means of the heads in the required predetermined angular relation.

Warp beams constructed in accordance with the present invention overcome the difiiculties of previously known constructions and assembling methods by enabling the beam heads to be secured firmly in abutting relationship with the barrel ends without necessitating digging of the barrel ends into the inner faces of the heads, and at the same time enabling the easy positioning of the heads in the desired predetermined angular relation re quired for effective registration of the drive devices or means such as the sockets 12, 12* with the driving pins 13, 13 or the like. These advantages are obtainable in connection with the construction shown in Figures 1 to 4 by the provision of a connecting means or elements having differential threaded engagement with the barrel end and the adjacent head or flange. The construction is such that the head may be brought into firm or tight abutting relation to the associated end of the barrel without its being necessary for the barrel end and head to be turned relatively to each other while in contact, which would cause the barrel end to dig into the inner face of the head, raising burrs or rough places which would catch filament material wound upon the beam. At the same time, the construction shown in Figures 1 to 4 enables a beam Thus it has been difficult or expensive to ashead to be positioned in a desired angular relation to the barrel or to the headat the other end of the barrel for enabling the drive means such as the sockets 12, 12- to register with the drive pins 13, 13.

' The beam head 2 is formed with a centrally located internally threaded part 19 which projects into the adjacent-end of the barrel 1. Inwardly spaced from the headpart 19 is an internally threaded part. 20 of the barrel 1, the threads on the head part 19 being of somewhat finer pitch than the threads on the barrel part 20. For example the threadson the head part 19 may be of 13 pitch, that is 13 threads per inch, whereas the threads on the barrel part 20 may be of 12 pitch, that is 12 threads per inch. A sleeve like connecting element 21 is provided "with externally threaded portions 22 and 23 formed to mate respectively with the threads of the head part19 and the barrel part 20, the threaded portions 22 and 23 being respectively of 13 pitch and 12 pitch. All of the axial threads are of the same hand.

To facilitate turning of the connecting element 21 for connecting the barrel 1 and head 2, the head is formed with an axial opening 24 through which a tool may be inserted before the stub axle plate 3 has been screwed into'place, the projecting end of the tool being then engaged with .tool receiving slots 25. Two suitable forms of tools are shown respectively in Figures 6 and 7. The tool shown in Figure 6 includes astem 100 provided with two diametrically opposed slots which receive fingers 101 pivoted to the stem at 102. A spring 103 is interposed between the fingers 101 for urging them outwardly in thedirections of the arrows shown in Figure .6. When .it is desired to turn the connecting element 21, the tool fingers 101 are squeezed inwardly against the force of the spring 103, and the fingers are inserted through the opening at the opposite end of the barrel to permit the tool stem to be projected through the barrel to bring the fingers 101 into the slots 25 of the connecting element 21. Thus, for turning the left hand connecting element 21 in assembling the parts, the tool is projected from the right hand end of the beam S until the tool fingers engage the slots 25 in the element 21 at the left end of the beam S. The tool may then be turned so as. to turn the element 2.1.

The alternative form of tool shown in Figure 7 includes a stem 104 and a single finger or cross piece 105 mounted in a stern slot 106 by a pivot pin 107. This tool may be projected through the axial opening 24 of the head 2 to be connected to the barrel 1, instead of being projected through an axial opening at the opposite end of the barrel. In using the tool shown in Figure 7, the finger 105 is rocked aboutits pivot 107 so as to bring it into substantial alignment with the stem 104, thereby permitting the finger 105 and stem 104 to be. projected inwardly through the axial opening 24, and the connecting element 21 until the finger has passed rightwardly be! yond the inner end of the element 21. The tool may then be manipulated to bring the finger 105 into a crosswise position, after which the tool is moved leftwardly to cause the finger ends to enter the tool receiving slots 25. Thereupon, the tool can be turned to screw the connecting element 21 as is required for connecting the barrel 1 and head 2 in the desired relative positions.

By following a method or procedure in accordance with the invention it is possible to effect the required firm connection of the beam head 2 to the adjacent end of the barrel 1 without scoring or otherwise damaging the contacting parts of the barrel and head, and at the same time to position the barrel and head in the angular relation required to enable the driving socket means at opposite ends of the beam to register with the driving pins 13 and 13. In a typical procedure, the connecting element 21 is first screwed into the threaded part 19 of the head 2 until the threaded portion 22 of the element 21 is substantially in full engagement with the threaded portion 19 of the head. The barrel 1 is then threaded onto the portion 23 of the connecting element 21 until the left end of the barrel touches the inner face of the head 2 in relatively light abutting relation to the latter. This screwing of the barrel 1 onto the threaded portion 23 of the element 21 should not be continued to an extent to cause the left end of the barrel to rub frictionally against the head with any considerable pressure. After the barrel 1 has been screwed onto the threaded portion 23 and into contact with the head 2, a tool is connected to the slots 25 of the member 21 as previously described, and the member 21 is then backed off, i. e. is turned rever'sely to the direction in which it was turned when being screwed into the head threaded part 119. Thus, all of the threads being of the same hand, for example all being right .hand threads, the connecting element. .21 will be backed off by turning it counterclockwise as viewed from its right end. Because of the differential pitch of the thread pairs 19, 22 and 20, 23, this will cause the barrel 1 and head 2 to be drawn axially toward each other without turning relatively to each other. In this way, the left end of the barrel 1 and the right hand face of the head 2 will be drawn into firm or relatively heavy abutting engagement without being rubbed together frictionally.

The angular relation between'the head 2 and the barrel 1 or the companion head 2* required to enable the sockets 12 and 12 to register with the pins 13 and 13 may be established by varying the extent to which the connecting element 21 is screwed into the head threaded part 19 before the barrel 1 is screwed onto the element 21. Regardless of the position to which the element 21 is screwed into the head threaded part 19 for establishing the desired angular relation, the final clamping of the barrel 1 and head 2 together will be cfiected in the man ner previously described, that is, by backing olf the connecting element 21 after the barrel 1 has been screwed onto the element 21 and into contact with the head 2.

In the construction shown in Figures 1 to 4 all of the threads are of the well known buttress type, and although these are preferred, other thread forms may be used providing the required differential relation between the threads is employed, and provided further that all threads are of the same hand. It is preferred that the finer pitch threads be those which connect the connecting element 21 to the head since with this arrangement the connecting element 21 can be run substantially all the way into the head, and when the element 21 has been backed ofi it still will be in contact with most of the threads in the head. It will be understood that means for connecting the right hand head 2 to the barrel 1 may be of the same construction as the means described above for connecting the left hand head 2 to the barrel.

In the modified construction shown in Figures and 8, the barrel 1 is connected to a head 26 by a differentially threaded means similar in principle and operation to the connecting means described with reference to Figures 1 to 4, but of different form. As shown in Figure 5, the head 26 has a hub 27 formed with a reduced portion 28 provided with external threads 29. The adjacent end of the barrel 1 is formed with internal threads 30 surrounding the external threads 29 in radially spaced relation and overlapping the threads 29 axially with respect to the beam. A connecting element 31 is formed with internal threads 32 engaging the external threads 29 on the head part 28, and with external threads 33 engaging the internal'threads 30 in the barrel. The threads 29, 30, 32 and 33 are all of the same hand, and the threads of the thread pair 29, 32 are of finer pitch than the threads of the thread pair 30, 33, thus providing the required differential thread relation. The connecting element 31 is formed with tool receiving slots 34, and the head 26 has an axial access opening 35, thus providing for the insertion of a tool such as is shown in Figure 7 for turning the connecting element 31 to bring the barrel 1 and head 26, into tightly clamped relation. The procedure for assembling the parts, positioning the head 26 in the desired angular relation to the barrel 1 or the head at the other end of the barrel, and for finally locking the head and barrel in tightly connected assembly is the same as that described in detail with reference to Figures 1 to 4.

Figures19 and show a tricot beam T embodying the invention, and Figure 11 shows a typical tricot beam arbor adapted to support a plurality of axially aligned and commonly supported tricot beams. In tricot beam drive arrangements it is usual to drive only one end of the arbor, but drive is transmitted simultaneously from the arbor to a plurality of beams positioned on the arbor, most conventionally by arbor keys received in keyways formed in the opposite ends of the tricot beams. The typical beam arbor 36 shown in Figure 11 is fitted with two keys 37 extending longitudinally throughout substantially the length of the arbor. The right end of the arbor is, formed with a flange 38 against which an endmost tricot beam may be abutted, successive beams being mounted on the arbor in serially abutting relationship. The left end of the arbor is threaded as at 39 for receiving a collar or fiange 40 equipped with clamping screws 41 which may be screwed against the adjacent endmost tricot beam, the collar 40 with its screws 41 cooperating with the flange 38for holding the beams against endwise movement.

-. 'The tricot beam shown in Figures 9 and 10 includes a barrel 42 and flanges or heads 43 and 44. The left hand head 43 is formed with an internally threaded part 45, and the left hand end portion of the barrel 42 is formed with an internally threaded part 46. A connecting element 47, similar to the connecting element 21 shown in Figure 3, is formed with externally threaded parts 48 and 49 engageable respectively with the threaded parts 45 and 46. All of the threads are of the same hand, and the threads of the thread pairs45, 48 are of finer pitch than the threads of the thread pair 46, 49. The head 43 is formed with an axial tool access opening 50 and the connecting element 47 is formed with tool receiving slots 51. The head 43 is provided with diametrically opposed keyways 52 adapted to receive the arbor keys 37 when the beam is mounted on the arbor 36. The head 43 may be connected to the barrel 42 by manipulation of the parts in the same manner as has been described above with reference to the assembling of the head 2 and barrel 1 shown in Figure 3.

The right hand head 44 of the tricot beam illustrated in Figure 9 is shown as being connected to the barrel by means of the kind shown in Figure 5. .Thus, the head 44 is formed with a hub 53 provided with an externally threaded part 54, while the barrel 42 is formed with an internally threaded part 55 surrounding the threaded part 54. A sleeve or connecting element 56 is provided with an internally threaded part 57 engaging the externally threaded part 54 of the hub 53. The element 56 is further provided with an externally threaded portion 58 mating with the internally threaded part 55 of the barrel 1. All of the threads 54, 55', 57 and 58 are of the same hand and have the required differential characteristic, the threads of the thread pair 54, 57 being of finer pitch than the threads of the thread pair 55, 58. The head 44 is formed with an axial tool access opening 59, and the connecting element 56 is formed with tool receiving slots 60. Keyways 61 for receiving the arbor keys 37 are provided in the head 44. The assembling of the head 44 and the barrel 42 in the required relative positions is efiectcd in the same manner as is described above with reference to the assembling of the head 26 and barrel 1 in Figure 5.

Although it is preferred that the finer pitch threads be those associated with the warp beam heads for greater strength considerations, it is apparent that the finer pitch threads may be those associated with the barrel when suitable factors of safety are employed.

The construction and method of connecting the head and barrel parts disclosed are illustrative, but are not intended to 'be definitive of the invention. The invention is defined in the claims.

I claim: I

1. In a warp beam or like construction, abarrel, at least one head required to be coaxially connected to said barrel, and means connecting said head to said barrel in firmly abutting relation to the adjacent end of said barrel and comprising a head part having screw threads extending axially of said head and barrel, a barrel part having screw threads extending axially of said head and barrel and being of the same hand as said head part screw threads, and a connecting element having screw threaded portions mating respectively with said head part screw threads and said barrel part screw threads, the head part screw threads and the barrel part screw threads having difierent pitches.

2. In a warp beam or like construction, a barrel, at least one head required to be coaxially connected to said barrel, and means connecting said head'to said barrel in firmly abutting relation to the adjacent end of said barrel and comprising a head part having screw threads extending axially of said head and barrel, a' barrel part having screw threads extending axially of said head and barrel and being of the same hand as said head part screw threads, and a connecting element having screw threaded portions mating respectively with said head part screw threads and said barrel part screw threads, the head part screw threads being of finer pitch than the barrel part screw threads.

3. In a warp beam or like construction, a barrel, at least one head required to be coaxially connectedto said 7 barrel and positionedin a predetermined angular location relative thereto, and means connecting said head to said barrel in firmly abutting relation to the adjacent end of said barrel and in any selected one of a plurality of angular positions relative thereto, said connecting means comprising a head parthaving screw threads extending axially of said head and barrel, a barrel part having screw threads extending axially of said head and barrel, and a connecting element having screwthreaded portions mating respectively with said head part screw threads and said barrel part screw threads, all of said threads being of the same hand and the head part screw threads and the barrel part screw threads having different pitches.

4. In awarp beam or like construction, a barrel, at least one head required to be coaxially connected to said barrel and positioned in a predetermined angular location relative thereto, and: means connecting said head to said barrel in firmly abutting relationto the adjacent end of said barrel and in any selected one of a plurality of angular posiitons relative thereto, said connecting means comprising a head part having screw threads extending axially of said head and barrel, a barrel part having screw threads extending axially of said. head and barrel, and a connecting element having screw threaded portions mating respectively with said head part screw threads and said barrel part screw threads, all of-said threads being of the same hand and the head part screw threads having a finer pitch than the barrelpart-screw threads.

5. In a warp beam or like construction, a barrel, at least one head required to be coaxially connected to said barrel and positioned in a predetermined angular location relative thereto, and means connecting said head to said barrel in firmly abutting relation to the adjacent end of said barrel and in any selected one of a plurality of angular positions relative thereto, said connecting means comprising a head part having internal screw threads extending axially of said head and barrel, a barrel part having internal screw threads extending axially of said head and barrel, and a connecting element having external screw threaded portions mating respectively with said head part screw threads and said barrel part screw threads, all of said threads being of the same hand and the head part screw threadsand the barrel part screw threads having different pitches.

6. In a warp beam or like construction, a barrel, at least one head required to be coaxially connected to said barrel and positioned in a predetermined angular location relative thereto, and means connecting said head to said barrel in firmly abutting relation to the adjacent end of said barrel and in any selected one of 'a plurality of angular positions relative thereto, said connecting meanscomprising a head part having external screw threads extending axially ofsaid head and barrel, a barrel part having internal screw threads. extendingaxially of'said head and barrel, and a connecting element having internal and external' -screw-threaded portions mating respectively withsaid head part screwthreads and said barrel part screw threads, all: of said threads being of the same hand and the head part screw threads. and the barrel partscrew threads having different pitches.

7'. In a warp. beam or likeconstruction, a hollow barrel, at least one head having an axial opening and being required tobe coaxially connected to said barrel and positioned in a predetermined angular location relative thereto, andv means connecting said head to said barrel in firmly abutting relation to the adjacent end of said barrel and in any selected one of a plurality of angular positions relative thereto, said connecting means comprising a head part having screw threads extending axially of said head and barrel, :1 barrel part having screw threads extending axially of said head and barrel, and a connecting element having screw threaded portions mating respectively with said head part screw threads and: said' barrel part screw threads, all of said threads 8 being ff. the same hand and the head part screw threads and the barrel part screw threads having different pitches, said connecting element being formed with a tool engaging portion adapted to be engaged by a tool extended from outside said barrel into said barrel for enabling said connecting element to be turned simultaneously relative] to both said head and said barrel.

8. In a warp beam or like construction, a barrel, at least one head required to be coaxially connected to said barrel and positioned in a predetermined angular location relative thereto, and means connecting said head to said barrel in firmly abutting relation to the adjacent end of said barrel and in any selected one of a plurality of angular positions relative thereto, said connecting means comprising a head part having internal screw threads extending axially of said head and barrel, a barrel part having internal screw threads extending axially of said head and barrel and being spaced axially of said head part screw threads, and a connecting element having mutually axially spaced screw threaded portions mating respectively with said head part screw threads and said barrel part screw threads, all of said threads being of the same hand and the head part screw threads and the barrel part screw threads having difierent pitches.

9. In a warp beam or like construction, a barrel, at least one head required to be coaxially connected tosaid barrel and positioned in a predetermined angular location relative thereto, and means connecting said head to said barrel in firmly abutting relation to the adjacent end of said barrel, and in any selected one of a plurality of angular positions relative thereto, said connecting means comprising a head part having external screw threads extending axially of said head and barrel, a barrel part having internal screw threads extending axially of said head and barrel and axially overlapping said head part screw threads, and a connecting element having screw threaded portions mating respectively with said head part screw threads and said barrel part screw threads, all of said threads being of the same hand and the head part screw threads and the barrel part screw threads having different pitches.

10. In a warp beam or like construction, a barrel, two heads mounted on said barrel and spaced from each other axially of the barrel, said heads respectively being provided with drive connection means required to be positioned in a predetermined angular relation to each other for enabling their respectively engaging separate driving elements in similar angular relation to each other, and means for connecting one of said heads to said barrel in firmly abutting relation to the adjacent end of said barrel and in a selected one of a plurality of angular positions relative to said barrel and to the other of said heads in which the drive connection means on said two heads are in said predetermined angular relation, said connecting means. comprising a head part having screw threads extending axiallywof' said head and barrel, a bar rel part having screw threads extending axially of said head and barrel, and a connecting element having screw threaded portions mating respectively with said head part screw threads and said barrel part screw threads, all of said threads being of the same hand and the head part screw threads and the barrel part screw threads having different pitches.

11. In a warp beam or like construction, a barrel, two heads mounted on said barrel and spaced from each other axially of the barrel, said heads respectively being provided with drive connection means required to be positioned in a predetermined angular relation to each other for enabling their respectively engaging separate driving elements in similar angular relation to each other, and means for connecting one of said heads to said barrel in firmly abutting relation to the adjacent end of said barrel and in a selected one of a plurality of angular positions relative to said barrel and to the other of said heads in which the drive connection means on said two heads are in said predetermined angular relation, said connecting means comprising a head part having screw threads extending axially of said head and barrel, a barrel part having screw threads extending axially of said head and barrel, and a connecting element having screw threaded portions mating respectively with said head part screw threads and said barrel part screw threads, all of said threads being of the same hand and the head part screw threads having a finer pitch than said barrel part screw threads.

12. In a method of securing a warp beam head to a warp beam barrel in firmly abutting relation to an end of the barrel and in a desired one of a plurality of angular relations to the barrel, the barrel and head respectively having threaded parts of the same hand and of difierent pitches, the steps of interposing between said head and said barrel a connecting element having threaded parts mating respectively with the head and barrel threaded parts, screwing said connecting element to said head part in one direction to a selected one of a plurality of locations corresponding to the desired angular relation of said head to said barrel, screwing said barrel to said connecting element in said one direction until the barrel and head are in said desired angular relation and said head and barrel end are in relatively light abutting relation, and then turning said connecting element in the opposite direction relatively to both said head and said barrel while holding said head and barrel in said desired angular relation, thereby to draw said head and barrel end into relatively heavy abutting relation.

References Cited in the file of this patent UNITED STATES PATENTS 173,239 Rice Feb. 8, 1876 1,630,058 Cundey May 24, 1927 2,237,837 Markle Apr. 8, 1941 2,499,989 Cramer Mar. 7, 1950 

